化学
电合成
草酸
电化学
激活剂(遗传学)
阴极
乙醛酸
无机化学
选择性
氧化还原
吸附
电极
化学反应
有机化学
催化作用
物理化学
生物化学
基因
作者
Yang-Liu Zhou,Xinsheng Zhang,Yang Dai,Yuan Wang
标识
DOI:10.1016/s0009-2509(02)00643-7
摘要
Electrosynthesis of glyoxylic acid by electroreduction of oxalic acid has long been well known. However, attempts to commercialize the process have encountered problems due to rapid deactivation of the cathode. The cathode activity can be continuously restored by adding small amounts of chemical activators to the catholyte. In this paper the structural effect of chemical activator on electrode reaction is studied. The results show that (1) It is the cation of the chemical activator, but not the anion that affects the current efficiency and the reaction selectivity. (2) The more symmetrical the cation, or the shorter the longest alkyl chain, the higher the current efficiency and the reaction selectivity become. (3) Mechanism of the activation is discussed. Adsorption of the cations of the activator on the cathode surface protects the electrode. (4) Quantitative characterization of the activator molecule is given using some topological indices, with which the activation ability can be predicted, and screening of the proper activator is made possible.
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